Normal distribution-English

NormalDistribution
This is a translation of the original posted in French by Daniel Mentrard — July 5th, 2012 - 13:38
http://www.geogebratube.org/material/show/id/13461
I have been unable to extract the text from the small box with the three curves for σ values of 0.5, 1 and 2, so that caption remains in French. The picture is self-explanatory.